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0.45-kg book slides off of your stack of books 1.75m above the ground, the eraser bounces back up to a height of 1.52m. How much energy is lost during the bounce (in J)? Having lost this energy, how fast does the eraser leave the ground after the bounce?
In the long jump final at the Olympics, a jumper launches herself at her max speed of 10 m/s. She generates a vertical push-off force by her legs of two times her own weight (2W).
A battery has fully charged a capacitor. The battery emf is ε= 20 Volt. The resistance R= 60 ohm. The capacitance C = 1.0 μF. Find what is the charge Q on the capacitor at t= 60 μs
A 1.4 kilogram 15 centimeter diameter solid sphere is rotating about its diameter at 70 rev/min. If an additional 5.0 mJ of energy are added to the kinetic energy, evaluate what is the new angular speed of the sphere
The Earth is constantly being bombarded by cosmic rays, which consist mostly of protons. what is the total charge incident on the atmosphere
Determine the rms speed of a helium atom on earth? (Assume the temperature on earth is 300K and the mass of helium is 6.68 x 10-27 kilogram)
After the Sun exhausts its nuclear fuel, its ultimate fate may be to collapse to a white dwarf state. Calculate the average density of the white dwarf
A wind turbine consists of three metal rods, each of mass 98kg and length 6.8 m connected at their ends to a central axle, asshown below. What is the momentof inertia of such a turbine
Suppose each red ball weighs 20 lbs. Find the potential energy (PE) for each ball on each ramp. In this lab mass is given in pounds and height is in feet, so use 32.2 ft/sec2 as the gravitational constant. Your answer will be in foot-pounds since ..
A plane is headed eastward at a speed of 156 m/s. A 20.0 m/s wind is blowing southward at the same time as the plane is flying. what is The velocity of the plane relative to the ground
A projectile of mass m is shot straight up with initial velocity vo and feels a quadratic air resistance force of the form F =-kv2, where k=mg/u2. Find the speed of the projectile at time t while the projectile is still moving upwards
The body of a 1284 kg car is supported on a frame with four springs. The spring constant of a single spring is 1.90×104 N/m. Four people riding in the car have a combined mass of 247 kg.
On a very hot day with an air temperature of 105°F, the wet-bulb thermometer of a psychrometer records 102°F.
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